화학공학소재연구정보센터
Electrochimica Acta, Vol.212, 286-293, 2016
Flexible sulfur wires (Flex-SWs)-A new versatile platform for lithium-sulfur batteries
A simple electrospinning methodology is described for generating novel fiber configurations of sulfur with the potential of yielding high performance sulfur electrodes for use in lithium-sulfur batteries. The unique fiber morphology derived by electrospinning has the capability of generating flexible sulfur yarns for the first time rendering them a highly attractive platform for small-scale mobile device applications such as textile-batteries. The electrospinning methodology reported herein also allows for the formation of a polymer-sulfur interface which acts as a physical barrier to liquid lithium electrolyte facilitating the reduction of polysulfide dissolution, a primary barrier to the progress of Li-S systems. Such flexible sulfur wire materials when converted into pellet sulfur electrodes, exhibit very stable capacities over 135 cycles with high areal capacities (similar to 2.5 mAh cm (2)). Coating the electrodes with an inorganic lithium ion conductor coating results in further improvement of cycling behavior with electrodes of similar to 650 mAhg (1) capacity and an impressive low fade rate of similar to 0.003% fade cycle (1) demonstrating the promise of this unique platform. (C) 2016 Elsevier Ltd. All rights reserved.